Demolition device



1967 w. B. CUNNINGHAM 3,358,779

DEMOLITION DEVICE Original Filed Feb, 17, 1965 INVENTOR W- B. QUNNtNQl-iAM BY QM S-Wk mm ATTORNEY United States Patent O Claims. (Cl. 173-119) ABSTRACT OF THE DISCLOSURE An impact-type demolition device mounted on a prime mover, the device having a housing with an impact member therein for delivery of spring-urged striking force, a slidable collar on the impact member, actuating linkage means secured to the collar for movement thereof against the spring bias to load the impact member, a catch means on one end of the housing to engage the impact member in its loaded position, and release means to permit spring urged movement of the impact member.

CROSS REFERENCE TO RELATED APPLICATIONS This application is a division of subject matter originally disclosed in my prior copending application Ser. No. 43 3,364, filed Feb. 17, 1965, now Unted States Patent No. 3,3 19,724.

BACKGROUND OF THE INVENTION (1) Field of the invention- This invention pertains generally to demolition devices finding a particular area of utilization in cooperation with conventional mobile construction equipment in the clearing of construction sites, roadbed distintegration, and the like.

(2) Description of the prior art Prior patents known to the applicant to be related to the general area of endeavour under consideration include the following:

Pat. No. 422,687Issued Mar. 4, 1890 Pat. No. 1,731,985-Issued Oct. 15, 1929 Pat. No. 2,017,470Issued Oct. 15, 1935 Pat. No. 2,342,601Issued Feb. 22, 1944 Pat. No. 2,517,980-Issued Aug. 8, 1950 Pat. No. 2,72l,49lIssued Oct. 25, 1955.

SUMMARY OF THE INVENTION The present invention is directed to the field of readily portable demolition equipment and to the combination of a vehicle having a work implement thereon, means for actuation of the work implement, and a supplemental disintegration tool useful with the work implement.

A basic object of the invention resides in the provision of readily portable impact imparting tools adapted for employment in the destruction of ground level materials such as existing pavement and roadbeds, and equally adapted for the clearance of walls and other upstanding materials.

A related object is to supply devices mounted on mobile apparatus and readily transported from place to place, and usable at varying angles with respect to the mounting thereof.

It is a further object of importance to supply an impact tool as aforesaid, for application to and use with existing construction machinery such as backhoes and/or other types of equipment, thereby obviating the need for special single function demolition tools at smaller job sites, or for the performance of relatively minor demolition projects at larger sites.

Yet another general objective of the invention resides in the provision of a ram or demolition device with an impact member, the impact member being driven in striking position by a spring means or the like, and the potential striking force being built up by compression or extension of the spring or similar means.

Further objects and advantages will occur to those skilled in the art following a consideration of the specification and drawings hereof.

DESCRIPTION OF THE DRAWING FIGURE 1 is a side elevational view of a portion of a typical construction machinery unit, having a first form of demolition device constructed and assembled in accordance with the teachings of the invention mounted thereon;

FIGURE 2 is an enlarge-d side elevational view of the demolition device of FIGURE 1, partially broken away;

FIGURE 3 is a sectional view taken substantially on the section line 3-3 of FIGURE 2, looking in the direction of the arrows; and

FIGURE 4 is a transverse sectional view on the line 4-4 of FIGURE 3, looking in the direction of the arrows.

DESCRIPTION OF THE PREFERRED EMBODIMENT Proceeding to a more detailed description of the invention, and initially to the form thereof disclosed in FIG- URES 1 through 4, the demolition device 10 is shown as applied to a typical unit of construction machinery 12. The machinery 12 may be of any suitable type, and preferably includes a prime mover (not shown), with an outward boom 14 having a pivotally mounted end boom 16 thereon. A first hydraulic cylinder assembly 18 is employed to pivot the end boom 16 with respect to the boom 14. A work element, such as a scoop 20, is pivoted on the distal end of the boom, and a second hydraulic cylinder assembly 22 operates the same. The second cylinder assembly 22 includes a cylinder 24 connected to the prime mover power source, and an extensible element 26 secured to the scoop 20, whereby extension and retraction of the element 26 pivots the scoop about the distal end of the end boom.

, The demolition device 10 comprises an elongated, tubular housing 28 which, as shown in FIGURE 4, is of substantially rectangular section. The housing includes side walls 30, 32, front and rear walls 34, 36, and has upper and lower ends 38, 40, respectively. As shown in FIG- URE l, bracket plates 42 connect the housing 28 to the boom 16 in an outwardly spaced relationship to the second cylinder assembly 22.

The side walls 30 and 32 have a pair of co-aligned openings 44 formed therein adjacent the upper end 38 of and a cross pin 46 is pivotally mounted pin 46 has an end portion 48 projecting outwardly of. the side wall 30 which carries a lever arm 50 apertured vertically adjacent its outer end, for a purpose described below. The pin further carries a pair of release catches 52 with substantially L-shaped grips, including arms 54 and feet 56 with raised leading ends 58.

The lower end 40 of the housing is provided with a journal cap 60 with a central bore 62 therein. An elongated, substantially cylindrical impact member 64 is mounted for axial movement within the housing 28 and extends through the bore 62. The member 64 is of heavy, substantially solid construction, and includes a reduced inner end 66 and an outer end 68 with an enlarged striking head 70 fixed thereto.

As best shown in FIGURE 3, a stepped collar 72 is fixed to the member 64 adjacent its end 68, and an upwardly spaced stop plate 74 is fixed thereabout adjacent G the end 66. A catch engagement pin 76 with laterally extending portions 78 is mounted in a transverse opening 80 in the end 66.

A second, slidable collar 82 is mounted on the member 64 between the fixed collar 72 and the stop plate 74. The slidable collar 82 has substantially cylindrical side lugs 84, 86, projecting therefrom on opposite sides, and

the lugs extend through elongated, vertically extending slots 88, 90, respectively, formed in the side walls 30 and 32 of the housing. Thus, the slidable collar is vertically movable within the limits set by the height of the slots 88 and 90.

Linkage means is provided between the impact mem ber 64 and the second hydraulic cylinder. The linkage includes elongated arms 92, 94. Each arm has an outer end 96 with an annular pivot eye 98 thereon. The eyes 98 are pivotally connected to the scoop 20 whereby the arms are movable responsive to extension and retraction of the member 26. The opposite ends 100 of the arms have annular bearings 102, 104 thereon engaging the lugs 84 and 36. The bearing 104 has an ear 106 thereon. A rod 108 is connected to the ear 106, and the rod 108 has a threaded upper end 110 with a set nut 112 thereon. The rod 108 extends through the aperture of the lever arm 50.

As best seen in FIGURE 3, a coil spring 114 is positioned about the impact member and has an end 116 abutting the collar 72, and an end 118 abutting the slidable collar 82.

FIGURE 3 illustrates the device in an initial position, with the catches S2 engaging the portions of the pin 76 to restrain the impact member against downward movement. Upon extension of the element 26 of the cylinder 22, the arms 92 and 94 cause the slidable collar to move downwardly, compressing the spring 114, and when the downward limit is reached, the nut 12 trips the lever 50, releasing the pin 76 from the catch 52, and causing the impact member to be sharply thrust outwardly of the housing. When the element 26 is retracted the arms 92 and 94 are returned to the full line position of FIGURE 2, the rod moving upwardly in a non-linear path and turning the lever arm 50 in a clockwise direction as viewed in FIGURE 2. This in turn results in reengagement of the catches 52 with the pin 76. Movement of the extension element 26 is then reversed, and the cycle of operation repeated.

Having described and illustrated an embodiment of this invention in some detail, it will be understood that this description and illustration have been offered merely by way of example and that the invention is to be limited in scope only by the appended claims.

I claim:

1. An impact imparting device comprising:

an elongated hollow housing;

the housing including opposite ends;

an impact member including a shaft and a striking head;

fixed collar means on the impact member;

a slidable collar on the impact member;

a spring means in the housing adapted to bias the impact member in one direction;

means to load the impact member in opposition to the spring bias, said means including a hydraulic cylinder with an extendable portion, and linkage means connecting the extendable portion of the hydraulic cylinder with the impact member; catch means mounted on one end of the housing to engage the impact member in its loaded position;

the linkage means being secured to the slidable collar for movement of the slidable collar against the spring bias; and

release means to permit spring urged movement of the impact member.

2. The invention of claim 1, wherein:

the spring means comprises a coil spring disposed within the housing about the impact member.

3. An impact imparting device for use with a boom mounted implement having a pivotal work element thereon and having an extensible and retract-able hydraulic cylinder assembly thereon including an extensible element connected at one end to the work element, the impact imparting device comprising:

an elongated housing having upper and lower ends;

bracket means securing the housing to the boom;

the housing including walls with elongated slots formed therein;

an impact member mounted in the housing for axial movement including an outwardly extended striking head and an upper end;

spaced apart, fixed collars on the impact member;

a movable collar on the impact member having lugs extending through the slots;

linkage elements secured to the lugs and to the extensible element of the cylinder; and

spring means about the impact member between the movable collar and one of the fixed collars.

4. The invention of claim 3, and:

catch means mounted on the upper end of the housing to engage the upper end of the impact member; and

release means extending between the catch means and one of the lugs.

5. The invention of claim 4, wherein:

the catch means includes a pivotally mounted pin with a projecting end portion;

a lever on said end portion;

substantially L-shaped catches on the pin;

a cross pin on the impact member seated on the L- shaped catches; and

a rod extended between said one lug and the lever arm to trip the lever upon extension of the extensible member.

References Cited UNITED STATES PATENTS 1,731,985 10/ 1929 Reaney 17346 2,517,980 8/1950 Cornett 17329 2,559,478 7/1951 Stone 173-119 2,721,491 10/ 1955' Klitzke 173-119 3,074,155 l/1963 Cootes et al. 1731l9 3,244,241 4/1966 Ferwerda 173-119 FRED c. MATTE-RN, IR., Primary Examiner.

L. P. KESSLER, Assistant Examiner. 

1. AN IMPACT IMPARTING DEVICE COMPRISING: AN ELONGATED HOLLOW HOUSING; THE HOUSING INCLUDING OPPOSITE ENDS; AN IMPACT MEMBER INCLUDING A SHAFT AND A STRIKING HEAD; FIXED COLLAR MEANS ON THE IMPACT MEMBER; A SLIDABLE COLLAR ON THE IMPACT MEMBER; A SPRING MEANS IN THE HOUSING ADAPTED TO BIAS THE IMPACT MEMBER IN ONE DIRECTION; MEANS TO LOAD THE IMPACT MEMBER IN OPPOSITION TO THE SPRING BIAS, SAID MEANS INCLUDING A HYDRAULIC CYLINDER WITH AN EXTENDABLE PORTION, AND LINKAGE MEANS CONNECTING THE EXTENDABLE PORTION OF THE HYDRAULIC CYLINDER WITH THE IMPACT MEMBER; CATCH MEANS MOUNTED ON ONE SIDE OF THE HOUSING TO ENGAGE THE IMPACT MEMBER IN ITS LOADED POSITION; THE LINKAGE MEANS BEING SECURED TO THE SLIDABLE COLLAR FOR MOVEMENT OF THE SLIDABLE COLLAR AGAINST THE SPRING BIAS; AND 